A047677 - OEIS

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A047677

Row 2 of square array defined in A047675: 2*n!*(n+1)!.

2

2, 4, 24, 288, 5760, 172800, 7257600, 406425600, 29262643200, 2633637888000, 289700167680000, 38240422133760000, 5965505852866560000, 1085722065221713920000, 228001633696559923200000, 54720392087174381568000000, 14883946647711431786496000000

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OFFSET

0,1

COMMENTS

a(n) = A152877(2n+1, 2n-2) for n > 0. - Alois P. Heinz, Nov 10 2013

LINKS

Table of n, a(n) for n=0..16.

MAPLE

a:= proc(n) a(n):= `if`(n=0, 2, n*(n+1) * a(n-1)) end:

seq(a(n), n=0..20); # Alois P. Heinz, Nov 11 2013

MATHEMATICA

2*Times@@@Partition[Range[0, 20]!, 2, 1] (* Harvey P. Dale, Sep 25 2017 *)

CROSSREFS

Cf. A047675, A010790, A152877.

Sequence in context: A038058 A062531 A141599 * A030276 A081476 A241806

Adjacent sequences: A047674 A047675 A047676 * A047678 A047679 A047680

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved